I have water running in the tub but when I turn on the shower I have no water pressure. I only get a trickle of water coming out of the shower. HELP!! :confused:

I am assuming that this is a tub/snower combo. Your mixing valve has a diverter to direct water to the shower. The diverter may be faulty but before we take it apart lets remove the shower head. Does your water pressure improve without the shower head?